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<br /> - -~._.__._-_._---- <br /> I <br /> I <br /> 1.7 REMOTE TRANSPONDER: A complete electronically encoded radio frequency .. <br /> automated meter reading system will consist of a meter mounted electronic encoder and a pre- <br /> wired remote transponder. The transponder shall be mounted in a location not subject to <br /> submergence and as high above the meter as possible. Operating range, depending on the I <br /> surrounding environment, shall be 150 to 300 feet with a portable interrogator and 600 to 1500 <br /> feet with a van-mounted mobile interrogator. <br /> Each transponder must receive a unique I.D. signal from an interrogator. The remote transmitter I <br /> shall transmit a 32 bit data stream including the current reading, tamper status, and error detection <br /> code value. Maximum transmission time shall be 15 milliseconds. I <br /> 1.8 MEASURING CHAMBER: The measuring chamber shall be a suitable synthetic polymer <br /> and shall not be cast as part of the maincase. All disc assemblies shall be interchangeable in all I <br /> measuring chamber assemblies of the same size. The measuring chamber disc shall operate against <br /> a replaceable thrust roller, allowing for repair to A WW A standards. There shall be an elastomeric <br /> seal between measured and unmeasured water, preventing leakage around the measuring element. I <br /> 1.9 MAGNETIC COUPLING: The motion of the disc will be transmitted to the sealed <br /> transmitter register through the use of a magnetic coupling. I <br /> 1.10 STRAINERS: All meters must be provided with a corrosion resistant strainer, with an <br /> effective straining area at least twice the bore diameter which can be easily removed from .. <br /> the meter without the meter itself being disconnected from the pipeline. <br /> 1.11 CHANGE GEARS: Change gears will not be allowed to calibrate the meter. All registers of I <br /> a particular registration and meter size shall be identical and completely interchangeable. <br /> 1.12 ACCURACY AND HEAD LOSS TESTS: Because the City of Arden Hills feels no I <br /> meter reading system can be a substitute for poor quality meters, the City requires that all <br /> meters shall conform to the flow rates and head loss standards listed in Table # I. These I <br /> standards may exceed A WW A C-700, current revision, test flows, head loss and accuracy <br /> standards. <br /> I <br /> I <br /> I <br /> I <br /> .. <br /> 2 I <br />